Rhodanine carboxylic acid derivatives for the treatment and prevention of metabolic bone disorders

ABSTRACT

Compounds of general formula (I), in which m is 0-8, q is a 0-8, a is 0-4, A signifies a single or double bond, R 1 , R 2  signify hydrogen or lower alkyl and, when m signifies 2-8, R 1  and R 2  in the group CR 1 ═CR 2  can have various significances within the following sequence, R 3  signifies hydrogen or lower alkyl, X signifies hydrogen or —(CH 2 ) b —COR 4  with b=0-4, Y signifies hydrogen, —COR 4 , phenyl or indolyl residue R 4  signifies hydroxyl, lower alkoxy or the NR 1 R 2  residue, W signifies an optionally mono- or polysubstituted saturated or unsaturated mono-, bi- or tricycle which can contain hetero atoms, as well physiologically compatible salts, esters, optically active forms, racemates, tautomers, and derivatives which can be metabolized in vivo to compounds of general formula (I).

This application is a 371 of PCT/EP99/07248 filed Sep. 30, 1999.

The present invention is concerned with rhodanine carboxylic acid derivatives for the treatment and prevention of metabolic bone disorders, a process for their manufacture as well as medicaments which contain these compounds.

In healthy persons the synthesis and degradation processes in bones is almost in equilibrium, i.e. the activity of the osteoblasts and osteoclasts is balanced. However, if this equilibrium is disturbed in favour of the osteoclasts and/or to the detriment of the osteoblasts, this leads to a reduction in the bone mass and to a negative change in the bone structure and function.

Hitherto, bone resorption inhibitors such as oestrogens, calcitonin and biphosphonates have primarily been used for the treatment of metabolic bone disorders. The use of these substances is, however, limited and also does not show the desired effect in all cases. Compounds which have a stimulating activity on bone synthesis and in addition contribute to an increase in an already reduced bone mass are accordingly of especial significance for the treatment of metabolic bone disorders.

Compounds having the rhodanine carboxylic acid structural element are known as antidiabetics, cytostatics inflammation inhibitors and for the treatment of cardiovascular illnesses and bacterial infections.

The parathyroid hormone (PTH), a hormone from the parathyroid gland, is the natural ligand of the receptor and an important regulator for the maintenance of the calcium level in the body. PTH can stimulate bone formation or bone resorption. In this, it acts as a regulatory hormone on a series of enzymes, inter alia, on adenylate cyclase (cAMP synthesis) and on ornithine decarboxylase. PTH mobilizes calcium from bones in the case of calcium deficiency, reduces calcium excretion from the kidneys and simultaneously improves the resorption of calcium from the intestine by an increased synthesis of 1,25—(OH)₂D₃. A normalization of the calcium level is achieved by the action on these target organs. On the other hand, the incorporation of calcium in bones is stimulated in the case of an elevated calcium level. This osteoanabolic activity of PTH and its fragments has been attributed to the activation of adenylate cyclase and of cAMP-dependent protein kinases (Rixon, R. Whitfield, J. et al JMBR 9 (8) 1179-89 (1994).

Surprisingly, it has now been found that rhodanine carboxylic acid derivatives of the present invention stimulate the PTH receptor-mediated cAMP formation. Compounds of the present invention are accordingly suitable for the broad treatment of metabolic bone disorders. They can be used primarily to good effect where the bone synthesis is disturbed, i.e. they are especially suitable for the treatment of osteopenic disorders of the skeletal system such as e.g. osteoporosis, inter alia, osteogenesis imperfecta as well as for the local assistance in bone regeneration and osteoinduction such as e.g. in orthopedic and maxillary medical indications, in fracture healing, osteosyntheses, pseudoarthroses and for the healing in of bone implants. However, having regard to these properties they also find use in the prophylaxis of osteoporosis.

By their influence on bone metabolism medicaments with the rhodanine carboxylic acid derivatives of the present invention as active substances furthermore form a basis for the local and systemic treatment of rheumatoid arthritis, osteoarthritis and degenerative arthrosis.

The object of the present invention are compounds of general formula (I),

in which

m signifies a number between 0-8,

q signifies a number between 0-8

a signifies a number between 0-4

A signifies a single or double bond

R₁, R₂ signify hydrogen or lower alkyl, whereby R₁ and R₂ can be the same or different and, when m signifies 2-8, R₁ and R₂ in the group CR₁═CR₂ can have various significances within the following sequence

R₃ signifies hydrogen or lower alkyl

X signifies hydrogen or —(CH₂)_(b)—COR₄ with b=0-4

Y signifies hydrogen, —COR₄, phenyl or indolyl residue

R₄ signifies hydroxyl, lower alkoxy or the NR₁R₂ residue, whereby R₁ and R₂ can be the same or different

W signifies an optionally mono- or polysubstituted saturated or unsaturated mono-, bi- or tricycle which can contain one or more hetero atoms,

As a rule, lower alkyl signifies linear or branched alkyl residues with one to six carbon atoms, preferably methyl, ethyl, propyl, i-propyl, butyl, t-butyl, pentyl, hexyl, particularly methyl.

Alkoxy groups signify a combination of a C₁-C₁₀-alkyl group in accordance with the above definition with an oxygen atom, e.g. methoxy, ethoxy, propoxy, isopropoxy, butoxy and pentoxy groups.

Under monocycle there are to be understood optionally mono- or polysubstituted, saturated or unsaturated ring systems with 3-8, preferably 3-7 carbon atoms, which optionally can be interrupted by one or more hetero atoms, such as nitrogen, oxygen or sulphur, especially the phenyl, pyridyl, pyrimidinyl, pyridazinyl, pyrazinyl, cyclopentyl, cyclohexyl, cyclohexenyl, cycloheptyl, morpholinyl, thiamorpholinyl, piperidinyl, piperazinyl, tetrahydrofuranyl, tetrahydropyranyl, furyl, thiophenyl, imidazolyl, thiazolyl, oxazolyl, isothiazolyl, isoxazolyl, 1,2,3-triazolyl or 1,2,4-triazolyl residue, as well as residues such as e.g. phenyl phenyl ether, diphenylmethane and biphenyl. Substituents are preferably lower alkyl, alkoxy, alkoxycarbonylalkyl, alkoxycarbonyl, acetylamino, alkoxydialkylamino, amino, dialkylamino, benzyl, benzyloxy, benzyloxybenzyloxy, carboxyl, chlorophenylsulphanyl, dioxymethylene, mercaptoalkyl, nitro, phenoxy, styryl and halogen.

In the case of the bicycle set forth under W, this is preferably a residue such as the naphthyl, tetrahydronaphthyl, decalinyl, quinolinyl, chromane, chromene, isoquinolinyl, tetrahydroquinolinyl, tetrahydroisoquinolinyl, indolyl, benzimidazolyl, indazolyl, oxindolyl, benzofuranyl, benzothiophenyl, benzochiazolyl, benzoxazolyl or purinyl residue, especially the indolyl, naphthyl, benzimidazolyl, quinolinyl, tetrahydroquinolinyl benzothiophenyl and benzofuranyl residue, which optionally can be mono- or polysubstituted. Substituents are preferably lower alkyl, alkoxy, alkoxycarbonylalkyl, alkoxycarbonyl, acetylamino, alkoxydialkylamino, amino, dialkylamino, benzyl, benzyloxy, benzyloxybenzyloxy, carboxyl, chlorophenylsulphanyl, dioxymethylene, mercaptoalkyl, nitro, phenoxy, styryl and halogen.

In the case of the tricycle set forth under W, this is preferably a residue such as the anthracene, fluorene, dibenzofuran or carbazole.

Compounds of formula I wherein W is phenyl or indolyl, m and g are both 0, R₃ is hydrogen and A is a double bond are disclosed e.g. in EP-A-0677 and EP-A-0587377, however for the treatment of Alzheimer's disease or as hypoglycemic agents.

Therefore subject of the present invention are also new compounds of formula I

in which

m signifies a number between 0-8,

q signifies a number between 0-8

a signifies a number between 0-4

A signifies a single or double bond

R₁, R₂ signify hydrogen or lower alkyl, whereby R₁ and R₂ can be the same or different and, when m signifies 2-8, R₁ and R₂ in the group CR₁═CR₂ can have various significances within the following sequence

R₃ signifies hydrogen or lower alkyl

X signifies hydrogen or —(CH₂)_(b)—COR₄ with b=0-4

Y signifies hydrogen, —COR₄, phenyl or indolyl residue

R₄ signifies hydroxyl, lower alkoxy or the NR₁R₂ residue, whereby R₁ and R₂ can be the same or different

W signifies an optionally mono- or polysubstituted saturated or unsaturated mono-, bi- or tricycle which can contain one or more hetero atoms,

whereas W is not phenyl or indolyl, if m and g are both 0, R₃ is hydrogen and A is a double bond, as well as their physiologically compatible salts, esters, optically active forms, racemates, tautomers, as well as derivatives which can be metabolized in vivo to compounds of general formula (I), as well as the use of these compounds for the production of medicaments.

Preferred are compounds of general formula I in which m signifies a number between 0 and 4, q signifes the number 0 or 1, a signifies a number of 0 to 4, A signifies a double bond, R_(1,2) signify hydrogen or methyl, X signifies hydrogen or —(CH₂)_(b)—COR₄ with b=0-2 and R₄ equals hydroxyl, methoxy or NR₁R₂, Y signifies hydrogen or COR₄, the phenyl or indolyl residue, R₃ signifies hydrogen or methyl and W signifies an optionally mono- or polysubstituted benzothiophene, phenyl, benzofuran, thiophene, naphthalene, piperidine, cyclohexenyl or biphenyl residue.

The manufacture of the compounds of general formula (I) is possible according to methods known per se. Examples of the methods of synthesis are set forth in Schemes 1 and 2; whereby R signifies the group:

The rhodanine carboxylic acids and aldehydes used as starting materials are either commercially available, known or can be prepared analogously to the generally known processes.

Compounds of formula (I) can be administered (sic) in liquid, solid or aerosol form orally, enterally, parenterally, topically, nasally, pulmonary or rectally in all usual non-toxic pharmaceutically acceptable carrier materials, adjuvants and additives. The compounds of formula (I) can also be applied locally to/in the bones (optionally with surgical intervention). The term parenteral embraces subcutaneous, intravenous and intramuscular delivery or infusions. Oral administration forms can be e.g. tablets, capsules, dragees, syrups, solutions, suspensions, emulsions, elixirs etc., which can contain one or more additives from the following groups, such as flavourings, sweeteners, colouring agents and preservatives. Oral administration forms contain the active ingredient together with non-toxic, pharmaceutically acceptable carrier materials which are suitable for the production of tablets, capsules, dragees etc., such as e.g., calcium carbonate, sodium carbonate, lactose, calcium phosphate or sodium phosphate; starch, mannitol, methylcellulose, talc, highly dispersible silicic acids, high molecular fatty acids (such as stearic acid), groundnut oil, olive oil, paraffin, miglyol, gelatine, agar-agar, magnesium stearate, beeswax, cetyl alcohol, lecithin, glycerol, animal and vegetable fats, solid high molecular polymers (such as polyethylene glycol). Tablets, capsules, dragees etc. can be provided with an appropriate coating, e.g. glyceryl monostearate or glyceryl distearate, in order to prevent undesired side effects in the gastrointestinal tract or to give a longer duration of action by the delayed absorption in the gastrointestinal tract. As the injection medium there are preferably used sterile injectable aqueous or oily solutions or suspensions which contain the usual additives such as stabilizers and solubilizers. Such additives can be e.g. water, isotonic saline, 1,3-butanediol, fatty acids (such as oleic acid), mono- and diglycerides or miglyol. For rectal use there can be used all suitable non-irritating additives which are solid at normal temperatures and liquid at rectal temperatures, such as e.g. cocoa butter and polyethylene glycol. Pharmaceutically usual carrier media are used for application as aerosols. Creams, tinctures, gels, solutions or suspensions etc. with the pharmaceutically usual additives are used for external application. The dosage can depend n a variety of factors such as mode of administration, species, age and/or individual condition. The doses to be administered daily or at intervals lie at 1-1000 mg/individual, preferably at 10-250 mg/individual, and can be taken at one time or divided over several times.

The compounds of formula (I) can also be applied locally to/in the bones (optionally with surgical intervention). The application directly to/in the bones (optionally with surgical intervention) can be effected locally or carrier-bonded either in solution or suspension, conveniently by infusion or injection. Carrier-bonded compounds of formula (I) can be administered, for example, as gels, pastes, solids or as a coating on implants.

Biocompatible and preferably biodegradable materials are used as the carrier. Preferably, the materials themselves also induce wound healing or osteogenesis.

For local application it is preferred that the compounds of formula (I) are imbedded in polymer gels or films in order to immobilize them and to apply these preparations directly on the site of the bone to be treated. Such polymer-based gels or films consist, for example, of glycerine, methylcellulose, hyaluronic acid, polyethylene oxides and/or poloxamers. Also suitable are collagen, gelatines and alginates and are described, for example, in WO 93/00050 and WO 93/20859. Further polymers are polylactic acid (PLA) and copolymers of lactic acid and glycolic acid (PLPG) (Hollinger el al., J. Biomed. Mater. Res. 17 71-82 (1983)) as well as the bone derivative “Demineralized Bone Matrix” (DBM) (Guterman et al. Kollagen Rel. Res. 8 419-4319 (1988). Also suitable are polymers as are used, for example, for the adsorption of TGFβ and which are described in EP-A 0 616 814 and EP-A-0 567 391 and synthetic bone matrices in accordance with WO 91/18558.

Likewise suitable as carriers for the compounds of formula (I) are materials which are usually used for the implantation of bone substitutes or otherwise of therapeutically active substances. Such carriers are based, for example, on calcium sulphate, tricalcium phosphate, hydroxylapatite (sic) and its biodegradable derivatives and polyanhydrides. Apart from these biodegradable carriers there are also suitable carriers which are not biodegradable, but which are biocompatible. Such carriers are, for example, sintered hydroxylapatite, bioglass, aluminates or other ceramic materials (e.g. calcium aluminium phosphate). These materials are preferably used in combination with the biodegradable materials, such as especially polylactic acid, hydroxylapatite, collagen or tricalcium phosphate. Further non-degradable carriers are described, for example, in U.S. Pat. No. 4,164,560.

It is especially preferred to use a carrier which liberates the compounds of formula (I) continuously at the target site. Especially suitable for this are e.g. “slow release pellets” from Innovative Research of America, Toledo, Ohio, USA. Pellets which release the compounds of formula (I) over several days, preferably up to 100 days with a daily dosage of 1-10 mg/kg per day, are especially preferred.

Preferred in the scope of the present invention are, apart form the compounds named in the Examples and compounds derivable by a combination of all of the significances of the substituents set forth in the claims, the following derivatives as well as their physiologically compatible salts, esters, optically active forms, racemates, tautomers as well as derivatives which can be metabolized in vivo to compounds of general formula (I), as well as the use of these compounds for the production of medicaments.

Preferred Compounds (PC)

1. [5-(9H-Fluoren-2-ylmethylene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

2. (4-Oxo-5-phenanthren-9-ylmethyl-2-thioxo-thiazolidin-3-yl)-acetic acid

3. [5-(3-Anthracen-9-yl-allylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

4. 3-[5-(10-Methyl-anthracen-9-ylmethylene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

5. 3-[5-(5-Furan-2-yl-penta-2,4-dienylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

6. 2-(5-Benzylidene-4-oxo-2-thioxo-thiazolidin-3-yl)-succinic acid

7. 2-[5-(2-Methoxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentane-dicarboxylic acid

8. [4-Oxo-2-thioxo-5-(2,3,4-trimethoxy-benzyl)-thiazolidin-3-yl]-acetic acid

9. {5-[3-(2,4-Dimethoxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

10. 3-[4-Oxo-2-thioxo-5-(2,4,5-trimethoxy-benzylidene)-thiazolidin-3-yl]-propionic acid

11. 3-{4-Oxo-2-thioxo-5-[3-(2,4,6-trimethoxy-phenyl)-allylidene]-thiazolidin-3-yl}-propionic acid

12. 2-[5-(2,5-Dimethoxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid

13. 2-[5-(2-Ethoxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentanedicarboxylic acid

14. [5-(2-Hydroxy-3-methoxy-benzyl)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

15. {5-[3-(3-Ethoxy-2-hydroxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

16. 3-[5-(2,3-Dihydroxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

17. 3-{4-Oxo-2-thioxo-5-[3-(2,3,4-trihydroxy-phenyl)-allylidene]-thiazolidin-3-yl}-propionic acid

18. 2-[5-(4-Diethylamino-2-hydroxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid

19. 2-[5-(2-Hydroxy-4-methoxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentanedicarboxylic acid

20. [5-(2-Hydroxy-5-methoxy-benzyl)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

21. {5-[3-(2,5-Dihydroxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

22. 3-[5-(2-Methyl-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

23. 3-{5-[3-(4-Methoxy-2,3-dimethyl-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

24. 2-[4-Oxo-2-thioxo-5-(2,4,6-trimethyl-benzylidene)-thiazolidin-3-yl]-succinic acid

25. 2-[5-(2,5-Dimethyl-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentane-dicarboxylic acid

26. {5-[3-(4-Methoxy-phenoxy)-benzyl]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

27. (5-{3-[3-(4-tert-Butyl-phenoxy)-phenyl]-allylidene}-4-oxo-2-thioxo-thiazolidin-3-yl)-acetic acid

28. 3-[4-Oxo-2-thioxo-5-(3-#p!-tolyloxy-benzylidene)-thiazolidin-3-yl]-propionic acid

29. 3-{5-[3-(3-Methoxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

30. 2-[5-(3,4-Dimethoxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid

31. 2-[4-Oxo-2-thioxo-5-(3,4,5-trimethoxy-benzylidene)-thiazolidin-3-yl]-pentanedicarboxylic acid

32. [5-(3,5-Dimethoxy-benzyl)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

33. {5-[3-(3-Benzyloxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

34. 3-[5-(3-Hydroxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

35. 3-{5-[3-(3-Hydroxy-4-methoxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

36. 2-[5-(3,4-Dihydroxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid

37. 2-[5-(3-Methyl-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentanedicarboxylic acid

38. [5-(4-Dimethylamino-benzyl)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

39. {5-[3-(4-Diethylamino-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

40. 3-[4-Oxo-5-(4-phenoxy-benzylidene)-2-thioxo-thiazolidin-3-yl]-propionic acid

41. 3-{5-[3-(4-Methoxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

42. 2-[5-(3-Benzyloxy-4-methoxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid

43. 2-[5-(4-Benzyloxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentane-dicarboxylic acid

44. [5-(4-Butoxy-benzyl)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

45. [5-(3-Naphthalen-1-yl-allylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

46. 3-[5-(2-Methoxy-naphthalen-1-ylmethylene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

47. 3-{5-[3-(2-Hydroxy-naphthalen-1-yl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

48. 2-[5-(4-Methoxy-naphthalen-1-ylmethylene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid

49. 2-(5-Naphthalen-2-ylmethylene-4-oxo-2-thioxo-thiazolidin-3-yl)-pentane-dicarboxylic acid

50. [5-(9-Ethyl-9H-carbazol-3-ylmethyl)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

51. {5-[3-(1H-Indol-3-yl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

52. 3-[5-(5-Methoxy-1H-indol-3-ylmethylene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

53. 3-[5-(3-Benzo[1,3]dioxol-5-yl-allylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

54. 2-[5-(4-Hydroxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentane-dicarboxylic acid

55. [5-(4-Hydroxy-3,5-dimethoxy-benzyl)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

56. {5-[3-(3-Ethoxy-4-hydroxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

57. 3-[5-(4-Hydroxy-3,3-dimethyl-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

58. 3-[5-(3-Biphenyl-4-yl-allylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

59. 2-[5-(4-Isopropyl-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentane-dicarboxylic acid

60. [5-(4-Ethyl-benzyl)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

61. [5-(4,4-Diphenyl-but-2-enylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

62. 3-[4-Oxo-5-(2-phenyl-propylidene)-2-thioxo-thiazolidin-3-yl]-propionic acid

63. 3-[5-(4-Methyl-5-phenyl-penta-2,4-dienylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

64. 2-[5-(2-Hexyl-3-phenyl-allylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentane-dicarboxylic acid

65. [4-Oxo-5-(5-phenyl-penta-2,4-dienylidene)-2-thioxo-thiazolidin-3-yl]-acetic acid

66. 3-{5-[3-(2-Methoxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

67. 3-{5-[5-(4-Dimethylamino-phenyl)-penta-2,4-dienylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

68. [5-(3-Ethoxy-4-methoxy-benzyl)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

69. {5-[3-(4-Diethoxymethyl-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

70. 3-[5-(4-Dimethylamino-naphthalen-1-ylmethylene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

71. 2-[5-(2,4-Dimethoxy-3-methyl-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentanedicarboxylic acid

72. [4-Oxo-5-(4-styryl-benzylidene)-2-thioxo-thiazolidin-3-yl]-acetic acid

73. {5-[4-(3-Dimethylamino-propoxy)-benzyl]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

74. {5-[3-(2,4-Dihydroxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

75. 3-[5-(2-Methyl-1H-indol-3-ylmethylene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

76. 3-{5-[3-(4-Hydroxy-3-methyl-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

77. 2-[5-(2-Hexyloxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentane-dicarboxylic acid

78. [4-Oxo-5-(4-propoxy-benzyl)-2-thioxo-thiazolidin-3-yl]-acetic acid

79. {4-Oxo-5-[3-(4-pentyloxy-phenyl)-allylidene]-2-thioxo-thiazolidin-3-yl}-acetic acid

80. 3-[5-(4-Octyloxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

81. 3-{5-[3-(5-Benzyloxy-1H-indol-3-yl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

82. 2-(5-Benzofuran-2-ylmethylene-4-oxo-2-thioxo-thiazolidin-3-yl)-pentane-dicarboxylic acid

83. [4-Oxo-5-(2,3,4,5,6-pentamethyl-benzyl)-2-thioxo-thiazolidin-3-yl]-acetic acid

84. {5-[3-(2-Benzyloxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

85. 3-[4-Oxo-2-thioxo-5-(2,3,4-trimethoxy-6-methyl-benzylidene)-thiazolidin-3-yl]-propionic acid

86. 3-{5-[3-(3-Ethoxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

87. 2-[5-(3,4-Dihydroxy-5-methoxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentanedicarboxylic acid

88. [5-(3,4-Dimethyl-benzyl)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

89. [5-[3-(4-Ethoxy-3-methoxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

90. 3-[5-(4-Hexyloxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

91. 3-{5-[3-(4-Heptyloxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

92. 2-(5-Benzo[1,3]dioxol-4-ylmethylene-4-oxo-2-thioxo-thiazolidin-3-yl)-pentanedicarboxylic acid

93. [4-Oxo-2-thioxo-5-(2,4,5-trimethyl-benzyl)-thiazolidin-3-yl]-acetic acid

94. {5-[3-(4-Decyloxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

95. 3-{5-[3-(4-tert-Butyl-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

96. {5-[3-(4-Amino-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

97. 3-[5-(2-tert-Butylsulphanyl-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

98. 3-{5-[3-(4-Butyl-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

99. 2-[5-(4-tert-Butoxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentane-dicarboxylic acid

100. [4-Oxo-5-(4-propyl-benzylidene)-2-thioxo-thiazolidin-3-yl]-acetic acid

101. [5-(4-Hexyl-benzyl)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

102. {5-[3-(4-Octyl-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

103. 3-[5-(4-Dodecyloxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

104. 3-{4-Oxo-5-[3-(4-pentyl-phenyl)-allylidene]-2-thioxo-thiazolidin-3-yl}-propionic acid

105. 2-[5-(3-Amino-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentane-dicarboxylic acid

106. [5-(7-Methyl-1H-indol-3-ylmethyl)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

107. 3-[4-Oxo-2-thioxo-5-(2-p-tolyl-ethylidene)-thiazolidin-3-yl]-propionic acid

108. 3-{5-[3-(3,5-Dimethyl-1-phenyl-1H-pyrazol-4-yl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

109. [5-(4-Hydroxy-2-methoxy-benzyl)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

110. {5-[3-(2,2-Dimethyl-chroman-6-yl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

111. 3-[5-(4-Isopropoxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

112. 2-[5-(4-Methyl-naphthalen-1-ylmethylene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentanedicarboxylic acid

113. {5-[3-(2,3-Dihydro-benzofuran-5-yl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

114. 3-(4-Oxo-5-quinolin-2-ylmethylene-2-thioxo-thiazolidin-3-yl)-propionic acid

115. 3-{5-[5-(4-Diethylamino-phenyl)-penta-2,4-dienylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

116. 2-[5-(4-Isobutyl-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentane-dicarboxylic acid

117. [5-(6-Methoxy-naphthalen-2-ylmethyl)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

118. {5-[3-(3,5-Dimethyl-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

119. 3-[5-(1-Hydroxy-naphthalen-2-ylmethylene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

120. [5-(4-Octadecyloxy-benzyl)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

121. {5-[3-(4-Diphenylamino-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

122. 3-[4-Oxo-2-thioxo-5-(3,4,5-trihydroxy-benzylidene)-thiazolidin-3-yl]-propionic acid

123. 3-{5-[3-(4-Dimethylamino-2-methoxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

124. {5-[2-(2-Hydroxy-ethoxy)-benzyl]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

125. (5-{3-[4-(2-Hydroxy-ethoxy)-phenyl]-allylidene}-4-oxo-2-thioxo-thiazolidin-3-yl)-acetic acid

126. 3-[5-(2-Benzyloxy-ethylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

127. 3-{5-[3-(4-tert-Butoxycarbonyloxy-3-methoxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

128. 2-[5-(2,4-Diethoxy-3-methyl-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentanedicarboxylic acid

129. [5-(2-Benzyloxy-3-methoxy-benzyl)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

130. {5-[3-(4-Methanesulphonyl-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

131. 3-[5-(2-Hydroxy-5-methyl-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

132. (4-Oxo-5-thiophen-2-ylmethyl-2-thioxo-thiazolidin-3-yl)-acetic acid

133. [5-(5-Naphthalen-2-yl-penta-2,4-dienylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

134. 3-[4-Oxo-5-(3-thiophen-2-yl-allylidene)-2-thioxo-thiazolidin-3-yl]-propionic acid

135. 3-{5-[3-(2-[1,3]Dioxolan-2-yl-6-fluoro-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

136. 2-[5-(3-tert-Butyl-4-hydroxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentanedicarboxylic acid

137. [5-(4-Benzyl-benzyl)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid 138. {5-[5,9-Dimethyl-11-(2,6,6-trimethyl-cyclohex-1-enyl)-undeca-2,4,6,8,10-pentaenylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

139. 3-[4-Oxo-5-(1H-pyrrol-2-ylmethylene)-2-thioxo-thiazolidin-3-yl]-propionic acid

140. 3-[5-(3-Furan-2-yl-allylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

141. 2-{5-[3-(5,6-Diethoxy-benzo[b]thiophen-2-yl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-pentanedicarboxylic acid

142. (4-Oxo-5-pyridin-2-ylmethylene-2-thioxo-thiazolidin-3-yl)-acetic acid

143. [5-(1-Methyl-1H-pyrrol-3-ylmethyl)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

144. {5-[3-(2-Hydroxy-4,6-dimethoxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

145. 3-[5-(4-Benzyloxy-2-hydroxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

146. 3-{5-[3-(5-Benzyloxy-2-hydroxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

147. 2-{5-[4-(Benzo[1,3]dioxol-5-ylmethoxy)-benzylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-pentanedicarboxylic acid

148. [5-(4-Benzyloxy-3,5-dihydroxy-benzyl)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

149. {5-[3-(2,5-Bis-benzyloxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

150. 3-[5-(4-Benzyloxy-3,5-dimethyl-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

151. 3-[5-(3-Cyclohexyl-allylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

152. 2-{5-[3-Methyl-5-(2,6,6-trimethyl-cyclohex-1-enyl)-penta-2,4-dienylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-pentanedicarboxylic acid

153. [5-(3,4-Diethoxy-2,5-dimethyl-benzyl)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

154. {5-[5-(3,4-Diethoxy-2,5-dimethyl-phenyl)-penta-2,4-dienylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

155. [5-(2-Carboxymethoxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

156. 2-{3-[3-(2-Carboxy-ethyl)-4-oxo-2-thioxo-thiazolidin-5-yliden]-propenyl}-benzoic acid

157. 2-[5-(4-Acetoxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentane-dicarboxylic acid

158. Methyl 4-(3-carboxymethyl-4-oxo-2-thioxo-thiazolidin-5-ylmethyl)-benzoate

159. 4-[3-(3-Carboxymethyl-4-oxo-2-thioxo-thiazolidin-5-yliden)-propenyl]-benzoic acid

160. 3-{4-[3-(2-Carboxy-ethyl)-4-oxo-2-thioxo-thiazolidin-5-ylidenmethyl]-phenyl}-acrylic acid

161. 3-{4-Oxo-5-[3-(4-oxo-4H-chromen-3-yl)-allylidene]-2-thioxo-thiazolidin-3-yl}-propionic acid

162. 2-[5-(4-Acetoxy-3,5-dimethoxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentanedicarboxylic acid

163. 3-(3-Carboxymethyl-4-oxo-2-thioxo-thiazolidin-5-ylmethyl)-benzoic acid

164. 4-[3-(3-Carboxymethyl-4-oxo-2-thioxo-thiazolidin-5-yliden)-propenyl]-phenyl propionate

165. 3-[5-(5,7-Dimethyl-4-oxo-4H-chromen-3-ylmethylene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

166. 3-{5-[3-(2-Ethoxycarbonylmethoxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

167. 2-[5-(8-Carboxy-naphthalen-1-ylmethylene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentanedicarboxylic acid

168. [5-(3,4-Diacetoxy-benzyl)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid

169. {5-[3-(2-Amino-4-oxo-4H-chromen-3-yl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

170. 3-[5-(2-Amino-6,7-dimethyl-4-oxo-4H-chromen-3-ylmethylene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid

171. 3-{5-[3-(6-Ethyl-4-oxo-4H-chromen-3-yl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

172. 2-[5-(6,8-Dimethyl-4-oxo-4H-chromen-3-ylmethylene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentanedicarboxylic acid

173. Methyl 2-(3-carboxymethyl-4-oxo-2-thioxo-thiazolidin-5-ylmethyl)-benzoate

174. Methyl 3-[3-(3-carboxymethyl-4-oxo-2-thioxo-thiazolidin-5-yliden)-propenyl]-1H-indole-6-carboxylate

175. 3-{5-[3-(4-Acetoxy-3-methoxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

176. 3-[4-Oxo-5-(3-phenyl-but-2-enylidene)-2-thioxo-thiazolidin-3-yl]-propionic acid

177. 2-[4-Oxo-2-thioxo-5-(1-#p!-tolyl-ethylidene)-thiazolidin-3-yl]-pentane-dicarboxylic acid

178. {5-[1-(4-Methoxy-phenyl)-ethylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

179. {5-[1-(3,4-Dichloro-phenyl)-ethyl]-4-oxo-2-thioxo-thiazolidin-3-yl}-acetic acid

180. [4-Oxo-5-(3-thiophen-2-yl-but-2-enylidene)-2-thioxo-thiazolidin-3-yl]-acetic acid

181. 3-[4-Oxo-5-(11-oxo-6,11-dihydro-dibenzo[b,e]oxepin-3-ylmethylene)-2-thioxo-thiazolidin-3-yl]-propionic acid

182. 3-{5-[3-(3,5-Dihydroxy-phenyl)-but-2-enylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-propionic acid

183. 2-[5-(4-Hydroxy-3-methoxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid

184. 2-[5-(4-Methyl-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid

185. 2-(4-Oxo-5-phenthylidene-2-thioxo-thiazolidin-3-yl)-succinic acid

186. 2-[5-(2,3-Dihydro-benzo[1,4]dioxin-6-ylmethylene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid

187. 2-[4-Oxo-5-(4-styryl-benzylidene)-2-thioxo-thiazolidin-3-yl]-succinic acid

188. 2-[5-(4-Allyloxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid

189. 2-[4-Oxo-5-(4-pyrrolidin-1-yl-benzylidene)-2-thioxo-thiazolidin-3-yl]-succinic acid

190. 2-[5-(3,5-Dihydroxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid

191. 2-{5-[3-(4-Methoxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-succinic acid

192. 2-[4-Oxo-5-(4-propyl-benzylidene)-2-thioxo-thiazolidin-3-yl]-succinic acid

193. 2-[5-(2-Ethoxy-naphthalen-1-ylmethylene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid

194. 2-[5-(3-Furan-2-yl-2-methyl-allylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid

195. 2-{5-[3-(4-Hydroxy-3-methoxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-succinic acid

196. 2-{5-[3-(4-tert-Butyl-phenyl)-2-methyl-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-succinic acid

197. 2-{5-[3-(2-Hydroxy-ethoxy)-benzylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-succinic acid

198. 2-{5-[3-(4-Hydroxy-3,5-dimethoxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-succinic acid

199. 2-[5-(3-Benzo[b]thiophen-2-yl-allylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid

200. 2-[5-(2,4-Bis-benzyloxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid

201. 2-(4-Oxo-5-pyridin-2-ylmethylene-2-thioxo-thiazolidin-3-yl)-succinic acid

202. 2-[5-(4-Benzyloxy-3,5-dimethoxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid

203. 2-[5-(3-Biphenyl-4-yl-allylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid

204. 2-[5-(3-Carboxy-4-hydroxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid

205. 2-[5-(4-Carboxymethoxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid

206. 2-[5-(6-Methyl-4-oxo-4H-chromen-3-ylmethylene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid

207. 2-[5-(6-Isopropyl-4-oxo-4H-chromen-3-ylmethylene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid

208. 2-{5-[1-(4-Methoxy-phenyl)-ethylidene]-4-oxo-2-thioxo-thiazolidin-3-yl}-succinic acid

The following Examples show some process variants which can be used for the synthesis of the compounds in accordance with the invention. However, they are not intended to be a limitation of the object of the invention. The structure of the compounds was proven by ¹H- and, where necessary, by ¹³C-NMR spectroscopy. The purity of the substances was determined by C, H, N, P analysis as well as by thin-layer chromatography.

EXAMPLE 1 General Process A

5 mmol of aldehyde of the formula R—CO, wherein R has the significance given above, and 5 mmol of 4-oxo-2-thioxo-thiazolidin-3-ylcarboxylic acid derivative are heated at reflux for 10 hours together with 15 mmol of sodium acetate and 15 ml of glacial acetic acid. After cooling, the mixture is poured into H₂O. The precipitate is filtered off under suction, rinsed with H₂O and dried. For purification, it is chromatographed over silica gel with ethyl acetateiheptane (2:1).

The preparation of 2-(4-oxo-2-thioxo-thiazolidin-3-yl)-glutaric acid and 2-(4-oxo-2-thioxo-thiaolidin-3-yl)-succinic acid is effected according to Chem. Heterocycl. Compd. EN 3 528-30 (1967).

2-(5-Benzo[b]thiophen-2-ylmethylene-4-oxo-2-thioxo-thiazolidin-3-yl)-succinic acid (1)

Yellow crystals; m.p. 240° C. (dec.)

2-(5-Benzo[b]thiophen-2-ylmethylene-4-oxo-2-thioxo-thiazolidin-3-yl)-pentanedioic acid (2)

Yellow crystals; m.p. 220-1° C.

2-[5-(3,5-Di-tert-butyl-4-hydroxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-3-phenyl-propionic acid (3)

Yellow crystals; m.p. 160° C. (dec.)

2-[5-(3,5-Di-tert-butyl-4-hydroxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-3-(1H-indol-3-yl)-propionic acid (4)

Orange crystals; m.p. 140° C. (dec.)

[5-(5-Acetylamino-benzo[b]thiophen-2-ylmethylene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (5)

Yellow crystals; m.p. >240° C.

5-[3-(4Methoxy-2,5-dimethyl-phenyl)-allyliden]-4-oxo-2-thioxo-thiazolidin-3-yl-acetic acid (6)

Red crystals; m.p. >240° C.

5-[3-(3,5-Di-tert-butyl-4hydroxy-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl-acetic acid (7)

Yellow crystals; m.p. >240° C.

[5-(2,3-Dihydro-benzofuran-5-ylmethylene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (8)

Yellow crystals; m.p. 246-7° C.

(4-Oxo-5-thiophen-2-ylmethylene-2-thioxo-thiazolidin-3-yl)-acetic acid (9)

Yellow crystals; m.p. 237-9° C.

(5-Benzo[b]thiophen-2-ylmethylene-4-oxo-2-thioxo-thiazolidin-3-yl)-acetic acid (10)

Yellow crystals; m.p. 292-4° C.

[5-(3-Naphthalen-2-yl-allylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (11)

Orange crystals; 275-7° C.

[5-(4-Methoxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (12)

Yellow crystals; m.p. 244-6° C.

[5-(5-Benzo[b]thiophen-2-yl-penta-2,4-dienylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (13)

Red crystals; m.p. >240° C.

[5-(4-Hydroxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (14)

Yellow crystals; m.p. 230-2° C.

[5-(4-Methoxy-2,5-dimethyl-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (15)

Yellow crystals; m.p. 240° C.

[5-(3-Benzo[b]thiophen-2-yl-allylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (16)

Orange crystals; m.p. >240° C.

[5-(4-Methoxy-3-methyl-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (17)

Yellow crystals; m.p. 235-6° C.

2-[5-(3,5-Di-tert-butyl-4-hydroxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-pentanedioic acid (18)

Yellow crystals; m.p. 130° C. (dec.)

[5-(4Benzyloxy-3,5-dimethoxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (19)

M.p. 128-30° C.

[5-(3,4-Bis-benzyloxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (20)

Yellow crystals; m.p. 187-8° C.

[5-(3-Biphenyl-4-yl-allylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (21)

Orange crystals; m.p. 130° C. (dec.)

5-[1-Methyl-3-(2,6,6-trimethyl-cyclohex-1-enyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl-acetic acid (22)

Brown crystals; m.p. 100° C. (dec.)

[5-(3-tert-Butyl-4-hydroxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (23)

Yellow crystals; m.p. >240° C.

2-[5-(3,5-Di-tert-butyl-4-hydroxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-succinic acid (24)

Brown crystals; m.p. 240° C. (dec.)

[5-(3,5-Di-tert-butyl-4-hydroxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (25)

Orange crystals; m.p. 120-1° C.

[5-(4-Benzyloxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (26)

Yellow crystals; m.p. 205-6° C.

5-[1-(3,5-Dihydroxy-phenyl)-ethylidene]-4-oxo-2-thioxo-thiazolidin-3-yl-acetic acid (27)

Yellow crystals; m.p. 184-8° C.

5-[1-(4Carboxymethoxy-phenyl)-ethylidene]-4-oxo-2-thioxo-thiazolidin-3-yl-acetic acid (28)

Yellow crystals; m.p. 111-20° C. (dec.)

[4-Oxo-2-thioxo-5-(2,3,4-trihydroxy-benzylidene)-thiazolidin-3-yl]-acetic acid (29)

Ochre-coloured crystals; m.p. 263° C. (dec.)

[5-(2-Hydroxy-4,6-dimethoxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (30)

Pale brown crystals; m.p. 194° C. (dec.)

[5-(3-Benzyloxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (31)

Yellow crystals; m.p. 178-81° C.

3-[5-(4-Benzyloxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid (32)

Yellow crystals; m.p. 188-91° C.

2-[5-(4-Benzyloxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid (33)

Yellow crystals; m.p. 125-8° C.

[5-(5-Benzyloxy-2-hydroxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (34)

Orange crystals; m.p. 130-3° C.

5-[4-(4-Methoxy-benzyloxy)-benzylidene]-4-oxo-2-thioxo-thiazolidin-3-yl-acetic acid (35)

Yellow crystals; m.p. 172-3° C.

5-[4-(Benzo[1,3]dioxol-5-ylmethoxy)-benzylidene]-4-oxo-2-thioxo-thiazolidin-3-yl-acetic acid (36)

Yellow crystals; m.p. 206-7° C.

5-[4-Oxo-2-thioxo-5-(3,4,5-trihydroxy-benzylidene)-thiazolidin-3-yl]-pentanecarboxylic acid (37)

m.p. 212-4° C.

5-[4-(3-Methoxy-benzyloxy)-benzylidene]-4-oxo-2-thioxo-thiazolidin-3-yl-acetic acid (38)

Yellow crystals; m.p. 191-3° C.

[5-(4-Hydroxy-3,5-dimethyl-benzylidene)-4-oxo-2-thioxo-thiazoidin-3-yl]-acetic acid (39)

Orange crystals; m.p. 277-9° C.

[5-(4-Benzyloxy-3,5-dihydroxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (40)

M.p. 178-80° C.

[5-(2,5-Bis-benzyloxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (41)

Yellow crystals; m.p. 196-8° C.

[4-Oxo-2-thioxo-5-(3,4,5-triacetoxy-benzylidene)-thiazolidin-3-yl]-acetic acid (42)

Orange crystals; m.p. 200° C. (dec.)

5-[3-(5,6-Diethoxy-benzo[b]thiophen-2-yl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl-acetic acid (43)

Red crystals; m.p. 252-3° C.

(5-Cyclohex-3-enylmethylene-4-oxo-2-thioxo-thiazolidin-3-yl)-acetic acid (44)

Beige crystals; m.p. 180-2° C.

[4-Oxo-5-(3-phenyl-propylidene)-2-thioxo-thiazolidin-3-yl]-acetic acid (45)

Orange crystals; m.p. 108-11° C.

5-[3-Methyl-5-(2,6,6-trimethyl-cyclohex-1-enyl)-penta-2,4-dienyliden]-4-oxo-2-thioxo-thiazolidin-3-yl-acetic acid (46)

Orange crystals; m.p. 153-5° C.

5-(3,5-Di-tert-butyl-hydroxy-benzylidene)-3-methyl-2-thioxo-thiazolidin-4-one (47)

Yellow crystals; m.p. >240° C.

Methyl [5-(3,5-Di-tert-butyl-4-hydroxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetate (48)

Yellow crystals; m.p. 165-70° C.

2-[5-(3,5-Di-tert-butyl-4-hydroxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-N,N-diethyl-acetamide (49)

Yellow crystals; m.p. 223-5° C.

Methyl 5-[3-(5,6-diethoxy-benzo[b]thiophen-2-yl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl-acetate (50)

Violet crystals; m.p. 211-5° C.

2-5-[3-(5,6-Diethoxy-benzo[b]thiophen-2-yl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl-N,N-diethyl-acetamide (51)

Red crystals; m.p. 210-2° C.

Benzyl 4-(3-carboxymethyl-4-oxo-2-thioxo-thiazolidin-5-ylidenmethyl)-piperidine-1-carboxylate (52)

Yellow crystals; m.p. 114-5° C.

5-[3,7-Dimethyl-9-(2,6,6-trimethyl-cyclohex-1-enyl)-nona-2,4,6,8-tetraenylidene]-4-oxo-2-thioxo-thiazolidin-3-yl-acetic acid (53)

Black (sic) crystals; m.p. 144° C. (dec.)

[5-(3,4-Dihydroxy-2,5-dimethyl-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (54)

Yellow crystals; m.p. >240° C.

[5-(3,4-Diethoxy-2,5-dimethyl-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (55)

Ochre coloured crystals; m.p. 185-90° C.

5-[3-(3,4-Diethoxy-2,5-dimethyl-phenyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl-acetic acid (56)

Green crystals; m.p. 210° C. (dec.)

5-[5-Methyl-7-(2,6,6-trimethyl-cyclohex-1-enyl)-hepta-2,4,6-trienyliden]-4-oxo-2-thioxo-thiazolidin-3-yl-acetic acid (57)

Black crystals; m.p. 192-5° C.

3-(5-Benzo[1,3]dioxol-5-ylmethylene-4-oxo-2-thioxo-thiazolidin-3-yl)-propionic acid (58)

Yellow crystals; m.p. 174-6° C.

3-[4-Oxo-2-thioxo-5-(2,6,6-trimethyl-cyclohex-1-enylmethylene)-thiazolidin-3-yl]-propionic acid (59)

Yellow-orange crystals; m.p. 166-8° C.

3-[5-(3,5-Di-tert-butyl-4-hydroxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid (60)

Yellow crystals; m.p. 218-9° C.

3-(5-Naphthalen-1-ylmethylene-4-oxo-2-thioxo-thiazolidin-3-yl)-propionic acid (61)

Orange crystals; m.p. 159-61° C.

3-[5-(3-Benzo[b]thiophen-2-yl-allylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid (62)

Orange crystals; m.p. 246-8° C.

[5-(4-Dibutylamino-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (63)

Orange crystals; m.p. 186-8° C.

[4-Oxo-5-(4-pentyl-benzylidene)-2-thioxo-thiazolidin-3-yl]-acetic acid (64)

Yellow crystals; m.p. 160≠2° C.

[5-(3-Methoxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (65)

Yellow crystals; m.p. 193-6° C.

[4-Oxo-2-thioxo-5-(2,4,5-triethyl-benzylidene)-thiazolidin-3-yl]-acetic acid (66)

Yellow crystals; m.p. 234-6° C.

[5-(2-Hexyloxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (67)

Yellow crystals; m.p. 148-50° C.

[5-(4-Methyl-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (68)

Yellow crystals; m.p. 234-6° C.

[5-(4-Methoxy-2,3-dimethyl-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (69)

Yellow crystals; m.p. 215-7° C.

[5-(4-Hydroxy-3,5-dimethoxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (70)

Orange crystals; m.p. 238-40° C.

5-(3-Carboxymethyl-4-oxo-2-thioxo-thiazolidin-5-ylidenmethyl)-2-hydroxy-benzoic acid (71)

Yellow crystals; m.p. >260° C.

3-5-[1-Methyl-3-(2,6,6-trimethyl-cyclohex-1-enyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3-yl-propionic acid (72)

Orange crystals; m.p. 160-1° C.

[5-(1,4-Dihydroxy-10-methoxy-5,8-dimethyl-3,7-dioxo-1,3-dihydro-7H-benzo[e]furo[3′,4′:3,4]benzo[b][1,4]dioxepin-11-ylmethylene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (73)

Dark green crystals; m.p. >260° C.

[5-(2-Methyl-1H-indol-3-ylmethylene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (74)

Brown crystals; m.p. 268-70° C.

[5-(3,4-Diacetoxy-benzylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid (75)

Yellow crystals; m.p. 193-5° C.

EXAMPLE 2

Compounds of general formula (I) were investigated in a suitable assay for the capability of stimulating cyclic adenylate cyclase.

TABLE I % cAMP Example (Test conc. No. Name 50 μM) 3 2-[5-(3,5-Di-tert-butyl-4-hydroxy-benzylidene)- 8 4-oxo-2-thioxo-thiazolidin-3-yl]-3-phenyl- propionic acid 13 [5-(5-Benzo[b]thiophen-2-yl-penta-2,4- 10 dienylidene)-4-oxo-2-thioxo-thiazolidin-3-yl]- acetic acid 16 [5-(3-Benzo[b]thiophen-2-yl-allylidene)- 8 4-oxo-2-thioxo-thiazolidin-3-yl]-acetic acid 22 5-[1-Methyl-3-(2,6,6-trimethyl-cyclohex-1- 10 enyl)-allylidene]-4-oxo-2-thioxo-thiazolidin-3- yl-acetic acid 23 [5-(3-tert-Butyl-4-hydroxy-benzylidene)-4- 8 oxo-2-thioxo-thiazolidin-3-yl]-acetic acid 25 [5-(3,5-Di-tert-butyl-4-hydroxy-benzylidene)-4- 40 oxo-2-thioxo-thiazolidin-3-yl]-acetic acid 46 5-[3-Methyl-5-(2,6,6-trimethyl-cyclohex-1- 30 enyl)-penta-2,4-dienylidene]-4-oxo-2-thioxo- thiazolidin-3-yl-acetic acid 59 3-[4-Oxo-2-thioxo-5-(2,6,6-trimethyl-cyclohex- 15 1-enylmethylene)-thiazolidin-3-yl]-propionic acid 60 3-[5-(3,5-Di-tert-butyl-4-hydroxy-benzylidene)- 20 4-oxo-2-thioxo-thiazolidin-3-yl]-propionic acid 72 3-5-[1-Methyl-3-(2,6,6-trimethyl-cyclohex- 15 1-enyl)-allylidene]-4-oxo-2-thioxo-thiazolidin- 3-yl-propionic acid 

What is claimed is:
 1. A method of treating a metabolic bone disorder in a subject in need of such treatment comprising administering to said subject an effective amount of a compound of general formula (I)

in which m signifies a number between 0-8, and q signifies a number between 0-8, wherein m and q are not both 0, a signifies a number between 0-4, A signifies a single or double bond, R₁,R₂ signify hydrogen or lower alkyl, whereby R₁,R₂ are the same or different and, when m signifies 2-8, R₁ and R₂ in the group CR₁═CR₂ optionally have various significances within the following sequence, R₃ signifies hydrogen or lower alkyl, X signifies hydrogen or —(CH₂)_(b)—COR₄ with b=0-4, Y signifies hydrogen, —COR₄, phenyl or indolyl residue R₄ signifies hydroxyl, lower alkoxy or the NR₁R₂ residue, whereby R₁ and R₂ are the same or different, and W signifies an optionally mono- or polysubstituted saturated or unsaturated mono-, bi- or tricycle which optionally contain one or more hetero atoms, wherein W is not phenyl or indolyl, if m and a are both O, R₃ is hydrogen and A is a double bond, or a physiologically compatible salt, ester, optically active form, racemate, tautomer or prodrug thereof.
 2. The method of claim 1 wherein the compound of general formula (I) is in admixture with usual pharmaceutical adjuvants and carrier material.
 3. A method of treatment or prevention of metabolic bone disorders in a patient in need of such treatment or prevention, comprising administering an effective amount of a compound of general formula (I)

in which m signifies a number between 0-8 and q signifies a number between 0-8, wherein m and q are not both 0, a signifies a number between 0-4, A signifies a single or double bond, R₁,R₂ signify hydrogen or lower alkyl, wherein R₁ and R₄ are the same or different, R₃ signifies hydrogen or lower alkyl, X signifies hydrogen or —(CH₂)_(b)—COR₄ with b=0-4, Y signifies —COR₄, phenyl or indolyl, R₄ signifies hydroxyl, lower alkoxy or —NR₁R₂, whereby R₁ and R₂ are the same or different, and W signifies an optionally mono- or polysubstituted saturated or unsaturated monocycle, bicycle or tricycle which optionally contains one or more hetero atoms, with the proviso that if W is a substituted phenyl, the substituent is selected from the group consisting of lower alkyl, alkoxy, alkoxycarbonylalkyl, alkoxycarbonyl, acetylamino, alkoxydialkylamino, amino, dialkylamino, benzyl, benzyloxy, benzyloxybenzyloxy, carboxyl, chlorophenylsulphonyl, dioxymethylene, mercaptoalkyl, nitro, phenoxy, styryl and halogen. 